Restore internal driver for aead_set_lengths

Signed-off-by: Paul Elliott <paul.elliott@arm.com>

library/psa_crypto_aead.c

@@ -471,6 +471,29 @@ psa_status_t mbedtls_psa_aead_set_nonce(
     return( status );
 }
 
+ /* Declare the lengths of the message and additional data for AEAD. */
+psa_status_t mbedtls_psa_aead_set_lengths(
+    mbedtls_psa_aead_operation_t *operation,
+    size_t ad_length,
+    size_t plaintext_length )
+{
+
+    ( void ) operation;
+    ( void ) ad_length;
+    ( void ) plaintext_length;
+
+#if !defined(MBEDTLS_PSA_BUILTIN_ALG_GCM) && \
+    !defined(MBEDTLS_PSA_BUILTIN_ALG_CCM) && \
+    !defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
+    {
+        return ( PSA_ERROR_NOT_SUPPORTED );
+    }
+#endif /* !MBEDTLS_PSA_BUILTIN_ALG_GCM && !MBEDTLS_PSA_BUILTIN_ALG_CCM &&
+         !MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305) */
+
+    return ( PSA_SUCCESS );
+}
+
 /* Pass additional data to an active multipart AEAD operation. */
 psa_status_t mbedtls_psa_aead_update_ad(
     mbedtls_psa_aead_operation_t *operation,

library/psa_crypto_aead.h

@@ -267,6 +267,47 @@ psa_status_t mbedtls_psa_aead_set_nonce(
     const uint8_t *nonce,
     size_t nonce_length );
 
+/** Declare the lengths of the message and additional data for AEAD.
+ *
+ * \note The signature of this function is that of a PSA driver aead_set_lengths
+ *       entry point. This function behaves as an aead_set_lengths entry point
+ *       as defined in the PSA driver interface specification for transparent
+ *       drivers.
+ *
+ * The PSA core calls this function before calling mbedtls_psa_aead_update_ad()
+ * or mbedtls_psa_aead_update() if the algorithm for the operation requires it.
+ * If the algorithm does not require it, calling this function is optional, but
+ * if this function is called then the implementation must enforce the lengths.
+ *
+ * The PSA core may call this function before or after setting the nonce with
+ * mbedtls_psa_aead_set_nonce().
+ *
+ * - For #PSA_ALG_CCM, calling this function is required.
+ * - For the other AEAD algorithms defined in this specification, calling
+ *   this function is not required.
+ *
+ * If this function returns an error status, the PSA core calls
+ * mbedtls_psa_aead_abort().
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param ad_length             Size of the non-encrypted additional
+ *                              authenticated data in bytes.
+ * \param plaintext_length      Size of the plaintext to encrypt in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         At least one of the lengths is not acceptable for the chosen
+ *         algorithm.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         Algorithm previously set is not supported in this configuration of
+ *         the library.
+ */
+psa_status_t mbedtls_psa_aead_set_lengths(
+    mbedtls_psa_aead_operation_t *operation,
+    size_t ad_length,
+    size_t plaintext_length );
+
 /** Pass additional data to an active AEAD operation.
  *
  *  \note The signature of this function is that of a PSA driver

library/psa_crypto_driver_wrappers.c

@@ -1706,9 +1706,9 @@ psa_status_t psa_driver_wrapper_aead_set_lengths(
     {
 #if defined(MBEDTLS_PSA_BUILTIN_AEAD)
         case PSA_CRYPTO_MBED_TLS_DRIVER_ID:
-            /* No mbedtls_psa_aead_set_lengths, everything is done in PSA
-             * Core. */
-            return( PSA_SUCCESS );
+            return( mbedtls_psa_aead_set_lengths( &operation->ctx.mbedtls_ctx,
+                                                  ad_length,
+                                                  plaintext_length ) );
 
 #endif /* MBEDTLS_PSA_BUILTIN_AEAD */
 

tests/src/drivers/test_driver_aead.c

@@ -171,8 +171,9 @@ psa_status_t mbedtls_test_transparent_aead_set_lengths(
     }
     else
     {
-       /* No mbedtls_psa_aead_set_lengths, everything is done in PSA Core. */
-       mbedtls_test_driver_aead_hooks.driver_status = PSA_SUCCESS;
+        mbedtls_test_driver_aead_hooks.driver_status =
+            mbedtls_psa_aead_set_lengths( operation, ad_length,
+                                          plaintext_length );
     }
 
     return( mbedtls_test_driver_aead_hooks.driver_status );